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makvit [3.9K]
3 years ago
11

Last week at Best Bargain, 75% of the computers sold were laptops. If 340 computers were sold last were, how many were laptops?

Mathematics
1 answer:
QveST [7]3 years ago
5 0

Answer:

255

Step-by-step explanation:

We need to find 75% of 340...

75%*340

Let's convert 75% to a fraction to make the math easier...

75/100*340

Now let's simplify 75/100 to again make it easier...

3/4*340=255

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Which equation of the solutions of x2 = -7x – 8
timama [110]

Answer:

x = 1, -5.56

Step-by-step explanation:

x^2 = -7x - 8

shift -7x and -8 to the other side . Remember when u shift minus changes into plus.

x^2 + 7x + 8 = 0

using quadratic equation formula

in quadratic equation one value comes positive and other comes in negative

a = 1  , b = 7 and c = 8

taking positive sign

x = (-b + \sqrt{b^2 - 4*a*c}) /2*a

x = (-7 + \sqrt{7^2 - 4*1*8} ) /2*1

x = (-7 + \sqrt{49 + 32} ) /2

x = (-7 + \sqrt{81} )/ 2

x = -7 + 9 / 2

x = 2/2

x = 1

taking negative sign

(-b - \sqrt{b^2 - 4*a*c} ) /2*a

x = (-7 - \sqrt{7^2 - 4*1*8} ) /2*1

x = (-7 - \sqrt{49 - 32} ) /2

x = -7 - \sqrt{17} / 2

x = -7 - 4.12 / 2

x = -11.12/2

x = -5.56

therefore x = 1 , - 5.56

4 0
3 years ago
Read 2 more answers
Find the flow rate through a tube of radius 6 cm, assuming that the velocity of fluid particles at a distance r cm from the cent
vaieri [72.5K]

Answer:

791.68 cm/s

Step-by-step explanation:

The volume flow rate can be interpreted as the integral of fluid velocity over area

\dot{V} = \int\limits^6_0 {v(r) 2\pi r} \, dr\\\dot{V} = 2\pi\int\limits^6_0 {(25-r^2)r} \, dr\\\dot{V} = 2\pi\int\limits^6_0 {25r-r^3} \, dr\\\\\dot{V} = 2\pi[12.5r^2 - r^4/4]_0^6\\\dot{V} = 2\pi(12.5*6^2 - 6^4/4 - 12.5*0 - 0)\\\dot{V} = 2\pi*126 = 791.68 cm/s

7 0
3 years ago
What is the value of X?
Deffense [45]

These angles are vertical angles meaning that they are equal to each other. Here is the equation for this problem:

x + 40 = 3x

Combine like terms

(x-x) + 40 = 3x - x

40 = 2x

Isolate x

40/2 = 2x/2

x = 20

Hope this helped!

4 0
3 years ago
The equation y = [x - 5] +2 is?
Ymorist [56]

Answer:

Groot

Step-by-step explanation:

5 0
3 years ago
A car travels 45 mph. How far will it go in 4 hours and 20 minutes?
ra1l [238]

<u><em>(The Explanation):</em></u> What we are given is that the car drives 45 miles each hour. Furthermore, you need to multiply the amount of hours desired to the miles to get a total mile.

<u><em>(Step-By-Step Instructions):</em></u>

<em>45(4) and 45(20) </em>          Multiply


<u><em>The Answers:</em></u> 4 hours = 180 miles /  20 hours = 900 miles

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3 years ago
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